Background: In recent years

X rays are widely used in various fields.With the rapid development of national economy

the demand of high quality

high reliability

and high stability miniature X-ray tube has grown rapidly.As an important core component of miniature X-ray tube

high voltage power supply has attracted wide attention.Purpose: To match miniature

the high voltage power supply should be small

lightweight

good quality

etc.Based on the basic performance requirements of existing micro-X-ray tube high voltage power supply

this paper designs an output from 0 to 30 kV adjustable miniature X-ray tube voltage DC power supply.Compared to half-bridge and full-bridge switching-mode power supply

its driving circuit is simple.With working on the linear condition

it has no switching noise.Methods: The main circuit makes use of DC power supply to provide the energy.The resonant Royer circuit supplies sine wave which drives to the high frequency transformer’s primary winding with resultant sine-like high voltage appearing across the secondary winding.Then

the voltage doubling rectifying circuit would achieve further boost.In the regulator circuit

a feedback control resonant transistor base current is adopted.In order to insulate air

a silicone rubber is used for high pressure part packaging

and the output voltage is measured by the dividing voltage below 5 kV.Results: The stability of circuit is better than 0.2%/6 h and the percent of the output ripple voltage is less than 0.3%.Keeping the output voltage constant

the output current can reach 57 A by changing the size of load resistor.This high voltage power supply based on resonant Royer can meet the requirement of miniature X-ray tube.Conclusions: The circuit can satisfy low noise

low ripple

low power and high voltage regulator power supply design.However

its efficiency is not high enough because of the linear condition.In the next design

to further reduce power consumption

we could improve the efficiency by controlling the current of resonant circuit.